American Lung Association reveals most polluted metro areas of 2014

April 30, 2014 |Compiled by John-Henry Perera

In its yearly "State of the Air" report, the American Lung Association has compiled a list of over 20 U.S. metro areas that are the "most polluted." The categories include ozone, year-round and short-term particle pollution. This gallery concerns itself with the ozone category.

Casey Christie / Associated Press

Bakersfield, Calif.

9of12

Metro: Bakersfield, Calif.Ozone: 3 out of 27724-hour particle pollution: 3 out of 277Annual particle pollution: 3 out of 277